Presumably this isn't the drives failing (they were new WD green drives and the whole thing has only been running for about 12 hours all told.
It could very well be - hard drives suffer infant mortality for sure. If they're going to fail, they often do so in the first few months. If they survive that, they can run for years and years.
I've had my Freenas running about 3 days now. I've just about loaded all my data to it (3x2tb hdd) and yesterday I got the above alert.
The gui says my drives are all healthy.It's taken me forever to load all my data from usb 2.0 hard drives. I don't really want to have to start all over again.
It's for this very reason (drive infant mortality) that you shouldn't trust FreeNAS with your data just yet. Do lots of tests, stress the drives, and if they survive that, then you can start putting real data on them. Consider the data disposable and don't rely on it until you can be sure the drives are reliable.
Do you have any SMART tests configured? You might want to post the output of:
Code:
sudo smartctl -a /dev/adaX
where X is 0 to 2 (i.e. /dev/ada0, /dev/ada1, /dev/ada2).
Unfortunately since you are not using ECC, any error checking or correction you do from this point is suspect. FreeNAS may be able to correct the errors or it might not, we won't be able to be sure. If the memory has flipped a bit and written it to the disks you won't be able to find it until you try to use that particular file.